Welcome to HCM
We understand your concerns
I went through your problem descrption. There is nothing you should worry of as there is good treatment available for almost every problem and of course god is with you, blessing you.
From the description you gave, it is very clear that you are strressed too much. The first headaches
were due to the incoming flu
. Flu do create cramps and body pain
. You should take proper rest for three days.
Sex during flu and tiredness is always not good at all. Avoid it. Take rest and you will feel better.
Hope this clears your doubts. Available for further clarifications.