I'm not sure about reusing the pump. Maybe a LLL leader could help answer that question. I have an Ameda Purely Yours which is v. easy to sterilize, so I plan to reuse it for my second child. That is if I don't wear it out from the first (11 months of pumping already!).
That is terrible! What kind of med was it?
When I pumped with my daughter my milk started to slow down and I had to take medication to try and help bring the milk back, but instead of helping it stopped my milk completely; when should I start pumping and what should I do if this happens again?
Pumping shouldn't decrease your supply. If you do have supply issues, try drinking Mother's Milk (Traditional Medicinals) tea, 2-3 cups per day. It works wonders. It can be found in health food stores. Or just try to breast feed more frequently. More demand=more supply.
Regarding when to pump, I'd say whenever it is convenient. I liked waking up at 5 am, before the baby, and pumping one breast. Then when dd woke up (7 am or so), I fed her off of the second breast. If she was still hungry, I'd give her the breast I pumped at 5 am. There was always enough milk.
Some women nurse their baby off of one breast while simultaneously pumping the other. I could never swing that. First of all, I'm just not coordinated enough (LOL) and DD DID NOT like the pump. I had to become a stealth pumper. Whenever she saw/heard my pump, she would cry I guess she didn't like the competition!