I cant get onn with my mum!!! :(?

basically i find it reely hard to get on with her! she tries her best for me but shes currently going through her menopause and she is really stressed all the time. she cant work because she has arthuritis in her back and my dad is sick too so he doesnt work but she tries her best to provide for us. but i dont get on with her she just keeps nagging me to do things all the time and im under pressure with exams at school its just too hard to keep running around i have no time for myself if i do all this stuff for her so we just fall out and its really upsetting me :(