Hello Mark. I am just one year into CML and imatinib.
During the first few days of my taking imatinib, I did feel slightly sick and needed to sit down for half an hour. This passed very quickly. I experimented with the timing of my taking imatinib and decided upon 4 PM. If you should encounter any gastric side-effects, then it is may be better to deal with these after work and before bedtime.
At age 63, I am still working three days plus per week and I have not lost one day in the past 12 months. I have also continued to swim for one hour three days per week.
I have suffered, by way of a side effect, an increase in bowel frequency which is also associated with urgency. This became far worse when I took the Accord generic version of imatinib. I also suffer from cramp periodically in my legs and feet.
I remain unsure whether I am meeting the required targets with imatinib (awaiting delayed results consultation) but I know that there are other TKIs available.
I try to remember that other medical difficulties do not all tie back to CML and TKIs. As my GP says, "you are allowed normal things occasionally".