Sssomeonee. Body for burning plz guide.

I am feeling tired,anxiety n always negative thoughts.though I try to be normal but don't know feel fearful while taking breath n it causes burning in my chest ,back n in stomach (for some hrs in a day n I am distracting my mind too for that) it may be because of my fear,overthinking n anxiety I have gone through 6 months back from that time it is continued.i am not feeling like as before that happy mood n excitement.it spoils my daily activities too n raises my heart beat .in gabharahat I check my heart rate n bp through smart watch.plz help me from that burning sensation in body n its not tr for whole day n may 2 hrs in a day r not at all in a day.for that sake I joined yogasana class from last 2 months n it gives me peace for some time but how to overcome from burning,fear,negative thoughts n anxiety.is it causes any problem inside body for burning plz guide.