Is It To Be Concerned About The Low Testerone Level?

My husband started feeling bad in January hurting all over ,weak ,tired could not go to work which he never misses,no appetite lost 30 lbs,bad headache . Went to doctor has had brain scan upper and lower Scopes abdomen and pelvic scans . The doctor stopped all his medicines and his blood pressure dropped for awhile 90's/70's now runs 115-125/70-78 he use to take medication for blood pressure. The doctor gave him a medication to stimulate his appetite and he is doing better on that but complains of a metalic taste all the time.last couple of weeks the bottom of feet are so painful he is having trouble . We even went to cancer specialist , only found his testerone level low now on androgen . I still feel he may have Lyme disease due to a bite he found on his abdomen that took about 2 months to heal we never found a tick.could it be lyme disease