Severe headache. Months. please suggest!

In the month of December 16 I was facing a severe headache for a week. At the end of week I got a chest pain. It felt like an heart attack. I rushed to the hospital and took ecg. It was normal. I was given acidity medicines and discharged. Then I visited a cardiologist, did tmt and ecg again but everything was normal. Doctor said the pain is due to acidity and gave me some medications. A week later the headaches were still on and was becoming worse and I also got a panic attack. I say so because the symptoms suggested that. Doctor gave me ciplar LA 40. I took this for 2 weeks and my headache came down drastically so later the dose was reduced to ciplar LA 20. I took it for a month and stopped it due to my regular exercise and yoga. But it's 5 months now I still have mild headache. Not able to concentrate at my work. I am fresh when I get up but the headache kicks in late morning and goes up till the evening. I had almost 3 panic attacks in the span of six months. Please suggest