Starting to think this will never end!!! is it all in my head???

Hi there everyone!! I'm new on here and feeling a bit silly right now!
I am a 20 year old female and feel like I'm going to explode!! I have so many symptoms and I just constantly feel in a state of panic!!! I just can't cope with feeling like this.

Basically this year has been terrible... First my dad lost his job so there has been a lot of financial difficulties at home. My dad moved out and to be honest I don't really hear from him anymore. I have changed my job twice. I have lost most of my friends probably because I never really go out socially anymore. I have had problems with a guy I'm seeing oh and to top it all of I got diagnosed hpv- genital warts strain.

About 6 weeks ago I had a cold and whilst I was sick I noticed a few flesh coloured spots on the back of my tongue... I had a sore throat and what felt like a constant lump in my throat. At first I ignored it and then I started looking things up in the on internet. I convinced myself I had hiv I spent every spare minute looking at hiv websites. Then I saw pictures of oral cancer and diagnosed myself with that. I spent weeks freaking out then about 2 weeks ago I started getting some more symptoms.
Chest pain/tightness
Tension headaches (like a band was being wrapped around my head)
Lump in throat
Choking/ strangling feeling
A shiver that runs right from the top of my head to my toes.
My neck/shoulders/upper back aches
Shooting pains in chest
Nausea
Shortness of breath
Muscle aches
The strange thing is I never have this symptoms persistently they come and go. They can last a few minutes a few hours. They don't all come at the same time. But I have these EVERYDAY! Especially the theater tightness and chest issues.

I finally went to the doctors about my tongue last Sunday. The doctor looked at my throat and said it looked fine. The spots were just enlarged taste buds. I didn't mention the rest of my symptoms I don't know why but I didn't.
I.
But the symptoms are still there!! today I had a particularly bad attack. It felt like my throat was swelling up, my chest was tight and I was getting shooting pains in my chest. I couldn't catch my breath and it felt like my breath was getting stuck. After a few minutes I guess the pain in my chest subsided although the tightness in my chest and throat stayed for about an hour.

I went to the doctors and she said everything sounded fine. But she gave me a five day course of antibiotics incase I have slight chest infection and a salamol inhaler for the tightness in my chest. She told me to come back in two weeks.... Asthma and emphasyma run in my family. Again for some reason I didn't tell her about everything else.... I don't know why I just couldn't.

This is taking over my life!!! I spend hours looking at medical websites. I can't sleep my mind just always seems to going at a million times an hour. I'm tired, I'm snappy, I cry at the smallest thing, I don't want to go out. It's affecting every part of my life! My friendships well what's left of them, my job, my home life, my realationship (I have absolutly no sex drive lately). I never used to be like this!! What's wrong with me??? I can't go on like this much longer!!! I'm twenty I should be enjoying life.

I am sorry about how long this is.... I needed a bit of a rant. If anyone has any ideas or advice please please please share... Thank you soooo much for reading!!!