How do I make my computer connect to a wireless network while also receiving internet service from my phone?

[Adam]

I live outside of a big city and cannot get any sort of wired high speed internet (Comcast, AT&T, etc.) so I have to use my phone as my internet source. I could use my phones hotspot but unfortunately I am limited to 2.5 GBs of data through the hotspot. However, I can tether my phone to my PC and take full advantage of my phones unlimited data plan.

What I am trying to accomplish is, I purchased a Chromecast which is a wireless receiver that allows you to stream services such as Netflix to a TV. I have set up my old wireless router to create a "wireless network" even though I have no internet run to it and my phone with not tether with my router. So my question is, how do I connect my PC to the internet with my phone and also connect it to the wireless network simultaneously so that it can communicate with the Chromecast?
I would like to add that when I try to connect my PC to the wireless network it disconnects from my phone. That is the issue I am dealing with. I understand the order in which the internet should "Flow", I just don't know how to make my computer stay connected to my mobile when I connect to the network.

[Frank S]

You should be able to connect multiple devices to your phone. If not, connect your phone through UBS and transmit the internet that way. Then connect the wireless to your computer so it connects to your Chromecast. Its a lot of settings that should be available in your networking folder to mess with. So the flow of internet should look like this: Phone => Computer => Router => Chromecast. But you should have an app on your phone to that controls your Chromecast. Hope this helps.