Y.C.
My recommendation is to give up on working out for now, except for gentle stretches and core exercises that are relaxing. You are doing enough right now!
As for the pumping, and your employer hassling you, they should know that they are breaking the law. Section 7 of the Fair Labor Standards Act of 2010 requires employers to support breastfeeding moms, because that is MORE IMPORTANT to society as a whole! Here's a link to the complete statute.
http://www.dol.gov/whd/nursingmothers/
If there is anyone at work that is supportive of your breastfeeding, show them this and ask them to send it up the chain on your behalf. Make sure that you are direct and up-front about your plans to pump. Don't fall into the trap of acting like you're doing something secret or shameful.
The first few weeks are the hardest! I know! I've been through it myself. Get a pumping bra, which makes pumping MUCH easier, and try to relax. Try to set up your pumping area to be as comfortable and private as possible, and use that time to relax and send waves of love to your little ones, and to yourself for being such an awesome mom.
Once you get that all sorted out, see if there is a little time at work to do some research on a possible next job. I hope your husband or friends are there to give you a big big hug, and help you to get through this tough time.