It's a tough stage, especially if you never get a break.
DS was a bit of a pain for not eating sometimes. I had good results with sitting with him and putting something small and boring on his plate while I tucked in with enthusiasm to a variety of things on my plate. He invariably asked to have a bit of what I was enjoying.
What also worked was letting him sit in front of the tv and give him a little bowl with a slice of apple, a piece of cheese, an oatcake (Nairs do nice ones), a bit of shredded ham and one jelly sweet. He would naturally eat the other stuff in reverse order of how much he liked them in order to eat the jelly. Note, this depends on personality, when I tried the same with DD she at just the jelly and asked for more, so she needed to just have a choice of savoury stuff.
I used to strap DD into her tricycle while I had a quick shower because she loved her tricycle, I'd give her a few toys to play with too.
With DS I went to some sort of baby group or class every morning, he was a total extrovert and needed to be around other people. He usually napped much better after running around too. If we were stuck at home for some reason then we had a long corridor in the flat and I would set up an 'obstacle' course for him. Things like tape ribbons or string across the corridor and he had to crawl under or jump over, a circle marked on the ground and he had to spin three times in it, play the toy drum, kiss the bear, he had to hop or jump between obstacles. Then do it again facing back wards, then do it again with one hand up in the air etc.