You seem to be describing symptoms that are consistent with hypothyroidism (decreased thyroid hormone production). Besides decreased energy, bloating, and weight gain, patients with hypothyroidism also have cold intolerance, depression
, and constipation. However, decreased energy and weight gain can be do to many other things other than hypothyroidism. Thus, your thyroid gland function must first be tested. Taking thyroid medication when you don't have hypothyroidism can be quite dangerous. Other possibilities that would need to be ruled out is adrenal gland deficiency, chronic fatigue syndrome, and hormonal imbalances. While you diet does sound very healthy, organic diets without any meat can result in some mineral deficiencies.
I suggest that you schedule an appointment with your primary care physician
. He or she can order a test of your thyroid stimulating hormone (TSH) which will likely be able to tell for sure if you are hypothyroid. If then your TSH is found to be high (and thus your thyroid hormone low), then you would warrant referral to an endocrinologist
who can work-up the cause of hypothyroidism (if there). Thyroid replacement medication should begin working towards reducing your symptoms within a few weeks. Often it takes some time to find the right dose for you. Good luck.