Short of breath. Sleep i dnt feel this.

I am facing short of breath..I had consult practo dr online before they sujjest anything I rush to hospital for same prob in emergency where they test serum I've,X ray,CBC,thyroid...everything is normal...5 months ago I deliver baby through c section..I had hypertension BP that tym..I got 2d echo,ecg also... everything is fyn...they free me by saying it's anexiety...but again after 10 day m.feeling same...I dnt worry now..but I feel miss a breath rhythm..sobbing kind of for 10 min...then it's normal when m busy in sumthing...it happns usually when I eat,work..when I lay down I feel normal..there is no snore or any problam while sleep..even I feel good...but whenever I take small nap(due to by baby feeding in night)..I feel little stressed..sobbing..if I take complete sleep I dnt feel this .but shortness of breath occurs sometime for 10 min..I had cough for 2 month..I had ambrodil 2 bottle..after that cough gone but since then I started feeling shortness of breath . help me