Thanks for the query to H.C.M.Forum.
Don't be desperate.
When you diagnosed for diabetes
type 1 , please mention next time.
You are feeling pain on the left side ,while E K G, blood gas, chest X ray, cardiac non stress test
,venous Doppler , cardiac ultrasound
all are normal.
You have V Leiden gene factor.
V Leiden develops blood clot and if, it in the lung (s) we call it PULMONARY THROMBOSIS
Pulmonary thrombosis is very notorious and very hard to detect ,if its size is very small.
If size of thrombus is big it develops respiratory difficulty.
If size of thrombus is small it develops hard breathing and pain as you feels.Pregnancy
aggravate the thrombosis and this thing you have noticed after your pregnancy.
So consult a physician/ pulmonologist and get in his opinion and get treatment.
Hope I have answered your question.
If further any question I will help.