From your symptoms of fatigue and tiredness, tingling sensations and
weight gain, hypothyroidism
should be ruled out. Symptoms of hypothyroidism
are fatigue,depression,weight gain,cold intolerance,dry, coarse hair and skin,constipation
,muscle cramps,decreased concentration,vague aches and pains,menstrual disorders,palpitation and swelling of the legs.
I feel that you should consult a physician and get yourself and your thyroid hormone levels evaluated.