Symptoms I have:
Bloating
Growling in my stomach area
Nausea
No fever/headache
Not being a doctor, I'd guess the antibiotic is giving you the nausea and the lomotil, constipation. I'd check with your doctor about going off the lomotil and taking acidophilus capsules instead during the antibiotic tx to try to prevent the diarrhea that can come from the antibiotic killing good as well as the bad bacteria.
My doctor instructed me to lay off lomotil once my diarrhea has been gone which I have. I am now only taking just antibiotics starting today.
God forbid me to have colon cancer or anything worst. None of my family member have this sickness/disease.
If you find you start having the diarrhea again, you might pick up over the counter acidophilus capsules and take as the bottle directs, because antibiotic often can cause diarrhea, since it kills good bacteria, not just the bad. God willing, you won't have cancer, but you should get an occult blood test since your concerned about it.
Plan to when I have the money soon. No health insurance.