Tagrisso dosage - 80 vs 40 mg

Throwing out a question to those of us taking Tagrisso.

I've been on the 80mg dosage for seven months now ... and the diarrhea side effect continues. I'm wondering if anyone has had their dosage changed to the 40mg pill and seen a reduction in that particular side effect. My doctor keeps saying "80 mg is the standard dose" but it's obvious my body isn't happy, and it makes going about my daily life uncertain... always looking for a bathroom nearby. Imodium does help but ....

Any thoughts from others on this NSCLC treatment journey are appreciated!