I have epilepsy and a benign brain tumor. I can relate, especially to the word finding issues.

I have found the best thing at work is not to bring it up. People don't want to deal with it and they misunderstand it as an admission that you can't do your job. Just get on with things the best you can.

For the word finding issues the most important thing is not to get frustrated (easier said than done). Try not to say "uhhhhh" too much, but it's ok if you ask, "What is the thing that..." Usually if I describe it in some way I remember the word. Be patient with yourself and expect people to be patient with you. The more stressed you get the worse it is. It's much more noticeable to yourself than other people, even if they do notice. For you its a major life issue, for them you just forgot what to call the thingamabob, gadget, or whatsahoozit. The worst thing is that sometimes you will loose their attention while you are trying to get it out. They don't have any patience anyhow, so don't mind too much.