I had asked for some further information and have not heard back, but I wanted to male the comments that can be made.
There are a couple of GI problems that may be present. If this has been a chronic symptom, it is likely that you are having some acid reflux, also called gastroesophageal reflux disease, or GERD. There are several over the counter medicines that can help with GERD, such as ranitidine or omeprazole.
For the difficulty having bowel movements, fiber is a reasonable first step, and the fiber intake can be increased to 25-35 grams per day, between fiber in the diet and in supplements/pills. If fiber is not sufficient, then another step that can be added would be a stool softener, such as docusate.
The usual medicine that would be used for the neck would be an anti-inflammatory medicine, such as ibuprofen or naproxen, but these medicines can exacerbate acid irritation syndromes, so it would be better to use acetaminophen.
As for the persistent infection, the next step would depend upon the nature of the infection and the antibiotics that have been tried thus far, which is why I asked for this information.
Please let me know if I can provide any clarification.