T2D - Feeling depressed

We've been moving our offices and I've had to do a lot of walking and standing. In fact, the past 3 days at work have consisted of standing, bending, and walking. Now my left leg and foot hurts all the time and by yesterday afternoon, even walking a few more feet was agony. One of my bosses yelled at me because instead of walking into another office to check on a piece of equipment, I asked him about it, since he was just in there. He ranted about my 'attitude'. After I finished with the tech on the phone and others were away from my office, I cried for aa few minutes. I just feel so defeated. I never had these issues before being diagnosed and I'm afraid to talk to my bosses about the physical issues I'm currently having. I used to be able to work 10-12 hours a day setting up computer equipment and yesterday, it was a chore to go 5 feet to another office. I was feeling so good when we first started the process of packing up files, supplies, etc last Friday.