why am i so angry and resentful

So lately I have been so resentful and angry...and the comon denominator seems to be my husband some old issues have come up and it is not helping.  He really tries to be nice sometimes but alot of times he is very selfish.  Ever since Dad got sick my time was consumed with responsibilities 24 hours a day then he died and I had to catch up with work and had more responsibilities....which were not good ...I loved taking care of my Dad and want him here and not gone....I work hard very hard but yesterday was my last day of work at my favorite job...I taught for the paramedic program in our area...I just taught labs and did skills tests but I loved it now every where is changing and requiring a 2 year assc degree to teach.....not an option for me so our whole program was fazed out it makes me very sad.....I still have my parttime job for the city but I dont like most of my coworkers there so I decided to cut my hours way back for this month and next month to finish handling the estate stuff...I have 2 houses to deal with and finally am having time to start working on all of this which is also very emotional....and sad ....it makes my heart ache.....I see Dad everywhere and honestly somedays dont know how I am going to get through this and meanwhile everyone else wants emotional support from me here.  I dont have it I cant even emotionally support myself.....everyone here also just wants me to be happy and I am not I am sad and angry and resentful.  Oh well we will see what today brings....I guess I will just get through it ...