Hi there, not everyone is the same, so not everyone will have the same experience. I will say I felt the same, measured the pros and cons, and still had a difficult time at the beginning. You need to see what benefits you, will this help you in the long run.
Some thing I never openly admitted here, I do suffer from migraines myself. Had one recently, they gave me a zomig nasal. Which before never worked. It did this time. I also deal with anxiety and insomnia. Which both have creaped up on me, I take meds for just not the dose I used to take. Hopefully in time, I don't need these. But if this is your worry, I can say there are things that you can still take.
Nausea~ I dealt with yes. I swore at the nurses and doctor, zofran does NOT work dor me, it took me to vomiting blood for them to finally get it (another story). They then put me on phenergran. They will help you.
Pain~ At first yes, (goes along with another story) but the day after my second surgery I was fine. Each day gets better.
One of my recomendations....have a nice pillow to cough with. It helped me. As far as the malnourishment and hair falling out, I believe these two things are plastered in my head. Is why I drink Water all the time.Sip sip sip sip sip......then in time it will; be chew chew chew chew chew.... Every one has a story, you will too. Some are good, some are not. It is how you deal with it. I would be happy to talk to you about my experience. Along with other peoples who are friends. They helped me tremendously. Hang in there, and never feel afraid to ask questions, or put out how you really feel. Someone may have been down that road who can tell you how they dealt with it.
I wish you the best no matter which decision you shall make. If you need anything at all, feel free to shout.