Hormone Blockers

Hi. I was diagnosed with early invasive carcinoma with lobular & ductal features, grade 2, ER/PR + and HER2- on 3rd March. I had a lumpectomy on 9th March and subsequently developed a large - 94mm - haematoma which popped on 4th April and has been bleeding since. It is not losing much now, but still enough to have delayed radiation. There have been 2 unsuccessful attempts to drain it, but it remains solid.  I am currently now scheduled to start radiation on 5th May and had the planning scan last Friday. I'm then due to start Letrozole 2 weeks after radiation finishes. My big concern at the moment is the Letrozole and the potential side effects. We have a 7 week trip to Europe booked to leave on 31st August and I'm terrified of side effects kicking in and affecting our holiday. There are plenty of stories on BC forums indicating how awful those side effects can be. What would you do?