I am sorry, I have not gone through this exactly; however, I can tell you if you think there is something wrong there probably is. You know your baby better than anyone, get another opinion.
Eg. My middle child "D" had issues: Just before he was a year old we got him the flu shot and he got what I thought was croop. It took 2 days to clear, I thought that was weird seeing croop should clear in 24 hours, but ok. then a week or 2 later his b-day party (1 yr old) and the next day croop again, this time it would not go away. ok it must be a bad cold then right, 7 days go by and not any better. I take him in. Doctor said he has a cold it will go away. Hum, ok you are the boss I thought. with in the next 7 days no improvement: actuall got worse. a rash on his butt appeared (must be from teething) and I swore his lips were a VERY light shade of blue at times (not all the time), so i took him in again. "It is just a cold you are waisting your time, and mine." I was so mad. I was doing everything I could at home to help him threw this (Chest PT's, Vaperizors, Decongentants, Humidifiers, Fluids everything) His breathing was so moist I could feel it in his ribs when I held him. SO SCARY. Well i got an appointment with a new doctor and another appointment with his regular doctor the day before giving him 1 more chance to get to the bottom of this. mind you this is now 3 weeks, and his nail beds were now blue(not all the time) NOT NORMAL!!! I took him in again and they again told me it was a cold, i demanded his records I went to this new doctors who rushed me over for a chest x-ray and blood work . Thought he had SEVER pneumonia to find out he was allergic to eggs, which was in like everything I fed him. OMG I was killing him slowly and no one would listen in the 1st doctors office. Now I thank goodness I switched.