10 Best Hyperthyroidism doctors in C R R I

Gaining belly fat even if you are active and eat properly might be the symptom of a condition called insulin resistance. This refers to a situation when your body does not react properly to insulin. The symptoms include weight gain in the belly, tiredness, and wanting to drink more water. To cope with this, take foods in balance, do frequent exercises, and consult a doctor so that they can have a medical check-up for the issue.

These might be symptoms of many things such as an infection or not drinking enough fluid. However, there are some things which could help in the meantime: make sure that you drink plenty of water, and get some rest. But if this goes on much longer without any improvement then I would advise seeking medical attention. They can give you proper treatment for whatever is causing all these different problems. 

Judging by your levels of Vitamin B12 and Vitamin D, it appears that they are low. Low B12 can be a reason for feeling tired and weak. Low Vitamin D can be a reason for bone pain and muscle weakness. You may need to get B12 and Vitamin D supplements. Besides, it's good to consume foods that are rich in these vitamins like fish, eggs, and dairy products. 

One potential reason is that you have a fast metabolism. Your body burns through calories very quickly, which can make it difficult for some people to gain weight. Other potential causes may include hyperthyroidism or problems with malabsorption. You should consult with a dietitian or nutritionist who will assist in creating a meal plan that helps increase your calorie intake healthily. 

The symptoms you mentioned, like pigmentation, hair loss, and irregular periods, could be related to PCOS. The underlying cause of these symptoms can be hormonal imbalance. You need to visit a doctor who will make a diagnosis and will offer treatment options.