dont want to ruin the friendship but in so much pain!

So I will cut to the chase. Close friends with my coworker, could be described as BFFs - we see eachother constantly out of work. I fell for her big time. The snag. Shes straight. She knows I am gay. I misread the "straight girl being affectionate with her friend" signs for the "I have feelings for you" signs. I told her my feelings and she let me down gently.

She still wants to be friends but its killing me, Im devastated and feel so foolish. We also still have to work together and its giving me major anxiety.

Any advice on how not to ruin things? How do I act, do I still invite her to hang out? Can I tell her if I am struggling and need space? Etc...please help its making me ill.