Lol.... Think we have very similiar profile .... Am turning 37.Wah since week20?! May I know how old are u. I'm turning 36 Gosh u must have freaked out. I'm also on nifedipine n often get its side effects plus sometimes my blood sugar level dips low, can feel very giddy and breathless. Don't worry too much, wait for ur next growth scan and see how is it.
Ha ha I walk ard w contractions for 4weeks before I Realise something is not right n told gynea.Then kena sent to delivery room followed by warded for 1 day to observe my contractions. So I got "full" maternity tour lol.
I also get breathless sometimes usually 1hr after lunch. Think is due to med, indigestion , bb fighting space w lungs etc. So far no notice low sugar level.
Actually was really surprised I have gdm as no history in my family n prior to preg my blood sugar is always optimum in my yearly general health checkup n I put on little weight.
For your case hope everything is under control. But take heart tat you r at relative safe period now w 32weeks