Sorry, but I am a SAHM with 2 children in secondary school and this is a fucking doddle of a life.
You need to understand that apart from my Mum who loved ironing, most people hate housework and given that you are home whilst he works full time, of course you should be doing it.
I do everything, bins out, cleaning, cooking, shopping, the full mental load of house, children, school, holidays.
The big problem you seem to have is you have 2 teens who do fuck all. You need to sort that out. My eldest son is 15 and can cook, clean, hoover, unpacks the dishwasher every day with his brother who is 12.
Yes when you are ill then your Dh should step up but he is working to provide for the family, you should be doing the housework. Yes it is tedious, monotonous, boring, thankless and dull but like me you clearly have time to sit down and be on MN 
If you are studying full time then you can talk to your Dh. But you are using the word help which means you see it as your responsibility and your Dh "helps" with housework.
I didn't choose to be a SAHM, it just sort of happened due to a job move. And 14 years of it takes it toll, but just think of all the women who did this in the 1950s with no real labour saving devices, no podcasts, no YouTube, no MN community, no TV on demand, no Netflix/Amazon prime. Christ we have it good.