Hello and thankyou for approaching DoctorSpring with your query.
I have gone through your case in detail and I understand your concern.
From all the symptoms you have described we will have to rule out an autoimmune disorder.
Your symptoms are likely to be related to an autoimmune disorder systemic lupus erythematosus (SLE). It is a chronic inflammatory disease of unknown cause and can affect multiple organs resulting in a myriad of symptoms. There are immunologic abnormalities resulting in a production of a number of antinuclear antibodies which is characteristic of this disorder.
Women are usually more frequently affected than men specially in the age group of 20s and 30s. Patient can have periods of remission or it can be chronic.
In some patients the symptoms are mild and aggravated by a particular incident like infection, pregnancy, surgery etc. . In some, there may be a trigger resulting in the symptoms to manifest, in your case pregnancy was the probable trigger.
I would advise you to get the following tests to help with your diagnosis if you have not already done them.
1) Complete Blood Count with ESR
2)Antinuclear antibodies (ANA)
3)Antibodies to double stranded DNA (Anti dsDNA)
Depending on the test results further tests will be carried out.
I hope this has helped. Please feel free to follow up.