F/63 recently diagnosed with ET. Want to ask a few questions

My mom (age 63) was diagnosed with ET about 5months back. Her platelet count was around 12 lakhs at the time. The doctor put here on HU at 3 tablets a day for 1 month. She had been taking 2 a day before this as prescribed by local doctor for about 2 months. At the end she became very weak due to the medication. We had checkup again after the 1 month period and everything was very low including the platelet and leukocyte was at around 1.8. We were advised to stop the medication for a week and after that she got better and test result was improving with leukocyte count reaching to 3.5 again but platelet has risen to 450. After taking 1 tablet a day for a week again as instructed platelet is still rising to 650 and now leukocyte count is also dropping again to 3. Doctor said follow the same routine for a month and get checked again. But if in one week it is going up that fast and leukocyte count is dropping I'm a little worried. Just want to ask about the experience of others and if there is anything in particular to avoid regarding food or habits or whatever and if anything really helps even a bit, since we were told not to take any supplements or vitamins during this time ?