Assalamu Alaikum guys. As you can see in the title these days I became sick because of extreme fear of fainting, becoming nothing, losing consciousness, and pure darkness after death. I also have doubts about Islam like "what if afterlife doesn't exist?" or "what if Allah doesn't exist?" which I am trying to forget and not to think about it but I can't get out of my head. I am getting these thoughts since I started doing salah. I used to be %100 sure about Islam before starting salah. When I started salah I started to have doubts which I usually ignored but soon these doubts growed which is now controlling my mind. I can't do anything right now, I can't go to school, I am only thinking about death and I am still teen and I have doubts about Islam. I am also having panic attacks because I sometimes think we will be nothing after we die which makes me extremely sad I hope it's wrong. I am also scared that my faith is not valid because I have doubts which makes me feel like I am doomed from each side. Someone please soothe me by giving proofs about Islam and afterlife. PLEASE SOMEONE HELP I AM GOING TO BE CRAZY!!!!!!