It is not uncommon for transplant patients to have easy tiredness and fatigue. Agree with the comment on having your transplant team review immunosuppressants and other medications as some are known to have this side effect. Also have your health care team check vitamin and micronutrient levels, as deficiencies can be present and levels including but not limited to TSH. Rule out sleep disorders including sleep apnea. If you had developed post transplant hyperglycemia and are on oral medication or insulin, blood glucose changes during the day may also be involved. Earlier comment on time from transplant surgery is quite correct. It takes time to get energy back. Some patients return to baseline but some have some residual loss of endurance and fatigue. Diet, weight loss and any loss of muscle mass needs assessment as well. Best of luck to you. Stay strong.