Anxiety help?

So I was diagnosed with severe GAD in 9th grade and was on medicine for two years and went to therapy for one year. I managed to get a handle on it and quit medicine and therapy all together by my senior year. It’s been a little over a year since, and I haven’t had any major anxiety issues until the other day. I had a random anxiety attack that I couldn’t stop. It had been years since, and it really frustrates me.

I was supposed to go to the beach today with my boyfriend but I got super bad anxiety again and I cancelled.

What can I do for my anxiety besides medicine and therapy? I don’t want to depend on it again and it’s also very expensive. Please help, I can’t go back to the person I was when anxiety controlled my life.