Lump feeling in throat since late November, help/advice?

Cancer
1
I've had a lump feeling in my throat (left side) for months now, its affected the way I eat, eg. gagging, little to no hunger... I do try to bring up phlegm often as well, feeling congested.. .During this period I've been getting voice cracks (rarely).. I do suffer from bad anxiety since I was little (I think it's a genetic thing, my mum has it) but it scares me a lot, also the other week I had to go to the ER because I was bringing up blood in my phlegm, it started as little to no blood but then got more and more, kind of a bright red as if something was bleeding.. I produced probably a little more than a tablespoon, the doctors couldn't find out what was wrong with me despite taking X-Ray's too.. I'm really scared because I'm only 18,, It isn't possible I have throat cancer...

image

This is the picture of the blood I was bringing up in my phlegm, it isn't good quality but I was pretty scared and wanted to show my boyfriend, I was also a few minutes away from when I was close to passing out, was losing my vision, hearing, hot and cold flashes..
2

I’m just so scared, I have a check up with my GP next month and I want to review this but I’d like to get some opinions before hand..