first day back to work

So i made it through my first day of work.  Thank goodness my boss let me sit down a couple of times.  I was a little nervous of that.  It sounds like the gentleman that highered me told my new boss and she must have told her lead cook about my cancer. Im not sure how i feel about that but I was glad to some extent so they can be there for me.  I made it the first hour with no problem and then about a little more than an hour i started getting hot.  I asked if we could use a fan (didnt know anyone new about my cancer at that point) i guess my boss turned on a cooler or something.  I went to the bathroom twice which she was okay with I think.  I did lean on the counters quite  bit during serving time and that is when she told me to go sit down.  She asked me at the end of the day if i thought i could make it and i told her yes and we talked about sitting down and it told her yea i might need to sit down one or two times a day. She seemed okay with that.  I worry a little because i dont know how much she reports to the gentleman who highered me.  My doctor signed the paper for me to work and gave me no restrictions.  I also told her it should get better and I hope it does.  I am not exsactly sure why i needed to lean on th counters or sit down other than i am still recovering from chemo.  Nothing spacific.  My back hurt during the day but that didnt seem to bother me enough to stop me from doing what i needed to do (i didnt need to sit for that).  I walked out at the end of the day and said see you tommarrow.  I dont want to loose my job. I want to keep moving along one day at a time.