Welcome to HCM
We understand your concerns
I am very much pleased to answer a healthy man's question. The sudden symptoms you mention are quite possibly are of tiredness
. The trouble is we usually become anxious on our sudden body pains or other negative feelings. This creates a sort of fear in us which in turn triggers negative hormones. They further makes the condition seem worse. That is the simple chemistry. So Don't worry.
Consult a physician if still in doubt.