I think I have a mental illness?

[Lena]

I am always scared of everything and have phases of being scared of silly things. About 6 months ago I had an unhealthy fear of alien abduction and now I'm scared of ghosts and the paranormal.
Recently for about a month I go to sleep fine but wake up after 3-4 hours of sleep and then fall asleep again. This first happened when I was ill and I slept all day and then had trouble sleeping at night but I got so freaked out that I developed this pattern and it makes me so scared. I also have nightmares all the time and I've recently started the pill.
I have a boyfriend and we argue quite a lot (not anymore) I have literally got so angry I've hit and scratched him to the point where he draws blood, I have also strangled him and thrive on reassurance and if I don't get it, I will lash out. He's once even called me a psychopath, out of anger of course. I cry uncontrollably and have a massive fit.
I also compulsively lie to him but he knows I am lying and I quickly tell him the truth (sometimes I feel so desperate for sympathy for us to stop arguing or to get my way I lie but I do tell the truth after). I hate doing it..
I always cry by myself over silly things ( like if I'm watching a film and I imagine I'm in that situation)
Whenever my train gets delayed, I cry and get scared.
Whenever the lights go off when I'm about to sleep, I get heart palpation and can actually hear it in my ears. Even when I day dream and I dream of a weird man who I think is a evil presence I will literally be shakey and off edge all day for about 3 months.
I worry about every little thing.
If a weird man on the train who seems perfectly normal, I will get off the train and go to a different coach. Also, if I see a man behind me, I will run and make myself look like a fool to my house.
Please help...
Additional Details
Also! I was friends with these 2 girls last year in school but fell out with them and have been scared to go anywhere ever since.
I go to college now and haven't seen them since, I check their twitters constantly, seeing where they are and if it's safe to go shopping or to the train station.
If they're there, I don't go.
They work in town, I don't go to town on weekends or holidays anymore.
I get the train later so hopefully they're at home by the time I get home.

I'm 17.
25 mins ago
I also have panic attacks if I hear someone be sick, I have a horrible fear of sick. I remember once I thought my mum was being sick and I was sweating and I felt I wasn't even in the room, my head was some where else.
I have deleted my facebook, made all my accounts private and I really think I have a mental illness.
19 mins ago
I also need everything clear or there will be this burning feeling in me.
My boyfriend's bed sometimes has crumbs in it, and this is my ultimate pet peeve, I will literally sweep the bed for hours and still won't be satisfied, he has to wipe his feet before he gets in and I will just feel overall disgusted. In my room, certain things have to be straight if not, I will literally go mad.
Also, I need to do things twice, so say if I accidentally hurt my knee, I will do it again
I've asked this question before but wanted more answers
Ignore the '25mins ago'
I copy and pasted!

[Tealey]

Admitting you may have a mental disorder is the first step to correcting it ! in my belief depression , anxiety, ocd , and other mental illnesses all stem from one thing they just have varying degrees .. I think it sounds like you could have ocd which is also related to anxiety , and depression they all go hand in hand ,,, I to have some mental disorders such as social anxiety, generalized anxiety , panic attacks , and depression.... the first thing you may wanna do is write down your symptoms and go to your doctor and let him know ask your doctor to get you into seeing a therapist and maybe consider taking some medications if all natural remedies fail , I myself take Ativan for my panic attacks .... I to get very jealous and need reassurance as well , your annoyance with certain things like what you have described sounds to me very much like ocd and ocd is a behaviour that we use to cope with underlying anxieties ,, research it , make and appointment with your doctor and seek help especially if it interferes with your life