The first thing you need to do is get a thorough physical.
Exhaustion can be due to many things.
It may be that you're working out too strenuously, but anything from hypothyroidism to low grade chronic infections can cause exhaustion. For vegetarians and vegans supplements can present some problems. Some CoQ10 is derived from animal tissues. And harvesting pollen may harm bees. Puritan's Pride and MotherNature and Solgar have good preparations.