No problem. I have my own worries at the moment which has been keeping me up.
I think you should avoid watching any kind of program that is going to escalate your anxiety. Again, you are making yourself worse. Just like googling symptoms and talking to friends about it, you only make it worse.
I also recommend you take up some stress relieving activities (at the very least) - just to take your mind off of your worries for a moment. And just a small tip, if you start to think "Have I stopped worrying" or "Am I relaxing" or "Am I feeling worried", let them happen but don't dwell on them. Instead, let them happen and then start to focus on whatever activity you are doing. Just lately, I have been listening to some binaural audios with headphones which works great. Type in "ASMR 93. 3D Head Massage (Binaural - Wear Headphones) - SOUNDsculptures - 3D Sound" on youtube for a great video that I usually play to relax me.
ASMR videos, in general, are great for relaxing. Anything like listening to music, drawing (even doodling), drawing zentangles like I previously mentioned, or just concentrating on breathing techniques will help relieve stress.
If you can start having daily relaxation sessions, this will help with your sleeping and eating habits. If you can improve your sleep, eating and have plenty of relaxation sessions each day, this will definitely help with your stress. I am positive that once you do this, your symptoms will at the very least improve (even if they don't completely go, they will improve). If they do, you can be confident that they are anxiety symptoms.
For me, your symptoms scream anxiety and not a brain tumour. But like I said, I cannot properly diagnose you but since you have been to I think at least two different doctors now (is that right?), and if they had any concern about you having a brain tumour, they would of immediately referred you for further tests urgently. Trust the doctors. I truly believe you are suffering from severe anxiety and therefore the symptoms that you are experiencing are as a result of this.
I hope you can get some sleep tonight. :)