It is nice to know that you have finished a course of the antibiotic therapy. No it is not the weakness that is troubling you. You need to take care of your hygiene. Use medicated soaps and antiseptics. Make sure you are not getting pus as it may complicate to sepsis
and infection leading to discomfort. Try eating semi-solid food like porridge for easy bowel movement.
If it has not healed well you may have to re-consult the treating physician. You should have it re-examined and have a test done for blood sugar, though furnicles do take time to cure completely. You may have to take a repeat course of the antibiotics, laxative or anti-inflammatory medicines for better relief. Take care.