Hi - any advice would be super helpful!

I was diagnosed with Her2+ last October.  I had 4 cycles of EC and something else..then 4 cycles of Docetaxel, herceptin and Pertuzamab, and now 14 more cycles of Herceptin and Pertuzamab.

I had surgery in July ( Mascectomy and Recon)  and then 15 rounds of Radiotherapy in September.

During my Docetaxel my gut was all over the place.  I had constipation for most of it, but then sometimes Diarrhea too.  So it was hard to know what my normal bowel habits were!  I read that Herceptin can give you Diarrhea.  But i think because of the Docetaxel, that won out and i was constipated!

I was then pretty constipated up until end of August, when suddenly one day i felt quite nauseous for 2 days, then suddenly had diarrhea.  Which i have now had for nearly 2 months!  Which is exhausting.  I had a colonscopy 2 weeks ago.  No cancer so that is brilliant.  But my question is.. as i am still on Hercpetin, I am wondering if that is causing my diarrhea?  Can it be a build up of Herceptin?  As i know one side effect is Diarrhea... but am wondering if it can be delayed.... and if anyone else has experienced this and what they did to cope?!  I am taking Imodium at the moment.

Thanks in advance!!