GAD, anyone have anxiety problems?

Ok so I have found that my anxiety changes a lot, it started last year when I was 15 I was staying at a hotel for a trip with my youth group and there were conference like meetings and concerts, there was a lot of people, and I found it hard to sit still in a room with even a few of them, and listen to them talk, my palms would be sweaty, my heart would beat so hard, I felt like throwing up, and my vision would be blurry and shaky, I just left a lot of these gatherings and after the weekend my mom took me to the doctor who told me that it sounded like anxiety, after research I see that it really sounds like GAD.

Over time my anxiety would bother me in social situations, I at one point had a speech class for homeschooling that only consisted of about 5 people, but you would not believe how hard it was to do that I felt like my legs would give out or I would have a heart attack, no matter how ridiculous that is also at work, I get like this for no reason at all, I just feel like I'm about to faint.

I also am always worring over small health issueds, and make them big, i annoy all family members with this one, and even myself, to an extent. I overthink things, and it stinks, because then i miss out, it can be something as small as knowing an answer in class and wanting to share, but thinking about how nervous i am so long that i miss out on the chance.

Also, a little over half a year into my first relationship I noticed that I was starting to worry a lot for no apparent reason I worry about my relationships future even though its going great, I wonder if he's right for me, even though I know we match perfectly ☺ not to brag or nothin, but he's perfect. Now all I need is to stop worrying, i brefly discribed my anxiety it to him, he seemed to understand, and i hope he does. I've been working on it and doing a little better, but sometimes its pretty bad. I overthink, worry and question things.

I know other people have these problems, and I was wondering what u guys did to help yourself? Will this really hurt my relationship?