Hi Nicolette
Welcome to the forum.
RLR has always the best advice and has always been on hand with reassurance.
I am just about to start anxiety management classes, I don't like taking any medication for my anxiety, because, at the end of the day the issues that have slowly caused you to have this anxiety disorder and along with the others you mentioned, will still be there once you've come off your medication, You do need to seek counselling and some sort of coping classes.
For now though, try to do some relaxation take a hour out every day if possible, do not take on things you really don't want to do, many people with our disorder seem to, so say No! adjust your thoughts, as soon as that little voice in your head starts telling you your going to die, try to ignore it, it won't happen! think of something pleasant, do some diaphramatic breathing, this is where you sit up straight, put your hands on your belly just below your and on the bottom of your ribs with your middle fingers just touching, then take a deep breath in through your nose so your middle fingers part slightly then exhale through your mouth slowly making your you empty your lungs properly do this a few times and it does help, 1 you are breathing properly not in short breaths which happens when your anxious and 2 your concentrating on that! it can make you feel a little light headed if you do it for to long so keep it short. I found changing my diet helped too, eat 6 small meals a day instead of 3 larger ones, RLR says always drink after not during eating, this works, also drink slowly, try and sit for about 20 mins after eating if you can't then don't do anything to quickly. For me avoiding caffine is good so no Tea, Coffee, Coke or Chocolate :'(, I nust admit I have cut down but I have the occasional chocolate bar and I drink de-caf tea, If you decide to drink de-caf, do not drink on a empty stomach!.
Avoid all fizzy drinks, and no spicy foods cut down on cheese if you eat alot of that. I was also told to cut out of limit the amount of leafy veg I eat as this causes wind. Do some exercise and I don't mean go to a gym I mean do some walking and drink enough water.
I know it sounds alot but it does help they won't completely go, but will calm them and help you deal with them better.
This is what works for me and it's worth a try. I was about 22 when I started noticing the missed beats and it's scary, mine also get aggrivated by my periods, but one doctor told me once that anxiety is heighten at this time so its a a big circle. Our thoughts are our biggest problem! Try to think more positively.
Hope you didn't mind me giving my opinion across and I hope it may have helped.
Kath x