Anxious & depressed

I haven't personally posted before on this app but I just need some support right now. I'm 18 years old and suffer from servere anxiety & depression. Over the last two years I have graduated high school and gotten a full time job. I have been happy and really loving myself and taking care of myself. Tonight was the first time in two years I suffered from an anxiety attack, we just moved my medication down, and I think this is what caused it. I was out tonight with my new boyfriend of two months and we went to eat, and we're supposed to go bowling. Towards the end of the dinner I felt my anxiety coming on strongly and I just told everyone I wasn't feeling well and excused myself to the bathroom, texting my mom and dad for reassurance that everything was okay and that I wasn't alone. I was an hour away from my house (bf and I live an hour away from each other) we left dinner and I was feeling a little better, but once we arrived in the car at bowling, I just cracked like an egg. I started crying to my boyfriend telling him I was anxious, and he knows I have anxiety and am on medication. And he got so mad at me. He wouldn't look at me or speak to me. I felt so alone I thought I could rely on this man and he would be there for me, with him having anxiety too I would think he would understand. He simply told his friends I had an anxiety attack and we left. We drove back to my house in silence, as I'm sitting in the passengers seat crying, shaking, and holding back my vomit. I have never felt so alone. He simply dropped me off without saying anything and left to go back to his friends. I understand why he was upset with me. But I just feel so alone.