The next day I went snorkeling and made a free dive to 20 or 25 feet and forgot to exhale on my way up. I also have ringing in my ears, though I always have that. None of my joints ache. It is a symptom of decompression illness and often is the only complaint a diver has. Usually, when a diver receives recompression treatment for limb pain, the underlying fatigue disappears along with the pain.
Exhaustion is also a prominent symptom of many other illnesses.
Given the dive profile that you describe, your fatigue is most likely not due to decompression sickness. If you continue to have problems, request an exam by a chamber physician and obtain treatment in a chamber. The fatigue might respond to the treatment. A friend of mine suffered some strokes a couple of years after one doctor said she might have decompression sickness. At that time, she was an airline attendant and flew after a dive, supposedly with enough time in between the dive and flying to be safe.