You do not develop symptoms deliberately.You could be under a lot of stress which aggravated due to the physical ailment that you suffered from recently.Besides as you said that you take stress over little things so that points out towards you suffering from anxiety disorder or maybe even depression which could be mixed with anxiety.
Next Steps
Consult with a physician to rule out organic causes.And also consult with a psychiatrist at your earliest.
Health Tips
You can do online consultation for both