My wife started to suffer from pain of the joints. she also has 37.6 fever. she is tired and exhausted. she is vegan and brest feeding.

Possible problem: Sean750, Joint aches, fatigue with low grade fever are most often symptoms suggestive of a viral infection, which is normally self limited lasting on average 7-10 days. If the symptoms progress, fail to resolve, or any additional symptoms occur such as joint swelling / redness or swelling / redness of the breasts you should seek medical attention.