High pulse. Kindly help in this!

Every time I eat I get felling anxious with pulse rate of around 120 which sometimes goes beyond 120 (highest goen 180, mostly happens when I am seating or lying which gets better when I stand up and starts walking. My doctor says you are over thinking and gave inderal la 20 mg tablets. Which helps me in lowing down my pulse but sometime I feel weired (like nervousness between my chests and throat )even when my pulse is perfectly normal i.e. Around 70 -75. I have gerd and allergic rhinitis also is this due to any of these conditions or it is a heart related or its anxiety only. As I have done ecg which is normal. This happens for around 10 months every day and whole day. When I wake up I am perfectly alright but after breakfast it starts and remains for the day until a take pill of inderal la. Also sometimes i feel i am unable to concentrate i.e. some pressure or hard to see. Also vertigo sometimes. also pain in eye lid on sides with swelling. Kindly help in this regards.