Hi @pollytps. I just found this message in my drafts. Not sure why it didn't send but I sending it again. Better late than never.
Rest assured, many other things may cause the scan to light up which is why they need to follow it up with other scans. My Pet lit me up like a Christmas tree and the CT confirmed node enlargement. This was due to me (unknowingly) having shingles at the time of the scans.
Your doctor should have given you a list for what you may experience. I always tell people to have medications on hand just in case as you do not need to suffer unnecessarily. My list of high suggestions is anti heartburn tablets, vertigo tablets, constipation and also gastro relief, panadol, anti histamine, the hospital will provide you with anti nausea. You may not need any of them but I reckon you are better off prepared. Stock up your freezer with precooked foods as you may not feel like cooking (I personally couldn't stand the smell of food cooking). Drink lots of water the day before and after chemo as it helps to flush it around.
I hope this helps. Hopefully you will have wasted your money getting prepared by not needing any of it. The nurses will prepare you for everything as they do this all the time. Rest assured, you will be in great hands.
Sending big hugs