I've never heard of probiotics, especially with the higher count, causing constipation. I guess your body is telling you something about your gut flora?
I do believe killcolitis has a point, especially in your situation where you can't use probiotics to repopulate the eradicated bacteria if you use antibiotics.
Years ago, whenever I got sick I would use GSE - grapefruitseed extract - it's quite strong, and they even use it in industrial strength version in hospitals as an antiviral and antibacterial - what about that?
I use to use 5 drops in a little juice 3 x per day.
What do you think?
Rx meds didn't help me. But 4.5 mg LDN +Paleo diet +supplements=REMISSION.Protein shakes w/almond milk,Maca powder,L-Glutamine,D-Ribose,chia seeds.VSL#3,K2,VIt. D3,slippery elm bark powder.For more info,my protocol is the 11th post at this link: https://www.healingwell.com/community/default.aspx?f=38&m=1666318
If you have any questions, you can find my email address at my profile.