Feeling heavy chest. Please help me.

I am 5feet 1inch tall and my current weight is 53kgs. In the year 2018, my weight increased from 49kgs to 56kgs and it remained the same from May to October. It was because of consuming junk foods. In the mid October, I joined a gym and started dieting and working out and came back to 53 kgs. I went to the gym for 2 months. Now, I don't go to the gym anymore and my weight is still 53kgs. It neither increased nor decreased. I don't have much junk food now and follow a good diet. I don't think I have cardiac problems. I have migraine and sinusitis and sometimes I take pain killers for severe migraine attacks which actually never helps. Sleeping only relieves the pain. I don't know what is happening. I don't have any body aches or pain in the chest but my chest feels so heavy. I feel like tons of load is put on my chest and I start panting after talking too much, still I can breathe normally. I can run, walk, do everything and I have not lifted any heavy weight. Please help me.