Heart attack fear. Not beleive that.

Since last 2 years im living with heart attack fear. Whatever symptoms/sensation happened in my body i think it is heart related problem. For example If a pricking pain happened in chest or left shoulder i think it heart/stoke problem If stomach pain happened its maybe cancer If headache happened i think it's brain tumors I can't live happily always worry about this symptoms. I took 6-7 ecg, 2 echo, 2 tmt, 2 chest xay, blood tets, thyroid test and all were normal. My avg BP level is 130/85 Total lipid 196 (LDL is 136) Non smoker and non alcohol My only concern is iam obese and sitting work Please some one help and save me doctor. Note: I don't have any chest pain, unusual sweating, breathing issue but 7-8 times heart palpitation happened in last 2 years. During palpitation i feel like am going to die but in next 30-40 mins I became normal. I visited many doctors and took many test. Even its normal i could not beleive that.