How do you overcome anxiety/ nervous sickness? please help me!?

I’m not like talking about roller coasters or presentation nervous- type.
I mean like when you are afraid to go to a guys house you like or maybe you’ve done something that isn’t necessarily bad, you just feel sick with guilt.

I’m fine in the moment it’s happening. But before it, I get really hot, constant nausea, loss of appetite( I haven’t eaten a proper meal in 4 days) , lack of sleep, Shake and butterflies. I have thrown up before because of it, and I know it shouldn’t effect me but it does. And I have no idea why, I have truer to change the way my mind looks at things but my nerves get me. I feel uncomfortable constantly. Any advice? I’m not gonna be able to see a doctor in time, so is there any video hypnosis thing that calms you down? Or maybe something I can keep telling myself?
I have already tried breathing. But I have asthma and I start tearing up because I can’t breathe properly haha. Please help me thanks in advance x

just dont give a damn

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