Anxiety advice please!

Hi. Okay so I have pretty bad anxiety, and I have sense I was really young. The symptoms I get vary, and as does the reason I get anxiety attacks (sometimes it’s random and sometimes provoked by certain things). I have been dating the same amazing guy for over a year and he’s done his best to help with my anxiety. We’re in our teens and because of Covid don’t see each other very often and when we do we usually just cuddle or hike and hold hands or such. Often times when we go on dates at some point I get quite nauseous to the point where I’m scared I’ll throw up. My boyfriend usually just rubs my back and tells me it’ll be okay and asks what he can do. I think these stomach aches are because of my anxiety but I don’t really know why I would be getting them. I really love my boyfriend and don’t want to break up with him or anything like that. He’s never done anything to hurt me or make me uncomfortable and we’re super open with each other so there’s nothing I’m hiding from him. I just feel really bad because these stomach aches have gotten to the point where they interrupt our time together. Does anyone have any advice or input? I’d love some help.

Sorry the message was so long. Please no negative comments it’s kinda a sensitive subject.