Your overthinking bro. I don't know anything about psychology but I used to have the same sort of problem. Always try to think about positive things and they will natrually happen. Basiclly keep yourself in a good mood. Also stress might be causing your headache, try to root out the problem and solve it. Once again i am not a expert, just based on expeirnce.
Viruses:
O reproduce by mitosis
cannot replicate on their own
are usually found in the soil
all of the above