Anyone on Gleevec (imatinib) and Tagrisso (osimertinib) ?

I’m the lucky duck with a newly diagnosed esophageal GIST and Stage IV lung cancer (NSCLA). I’ve been on Tagrisso since early February with a few inconvenient side effects (diarrhea, dry skin, runny nose and eyes). The surgeon, in consultation with my oncologist, would like to start me on Gleevec for the GIST prior to surgery.
1. Has anyone been on both of these at the same time?
2. What symptoms have you experienced on Gleevec?
3. Has anyone here had esophagectomy surgery?
Thanks!