short-temper and easily iriitable

hi..
i got married about 5 months ago and as a result had to go through some major changes in my life. first of all, im a pakistani and have lived and grown up in pakistan for my 22 years before i got married. my husband lives and works here, in america so i moved here with him right after my marriage. i never had to do any household work back home but here i have to do almost everything. my husband is very kind and loving and we have a very good relationship. he understands that ive undergone some major changes in my life so he is very indulging and understanding. he even helps with the housework a lot.
the problem is that ive become very short-tempered. i get angry and annoyed with my husband at very small matters. it never blows into a big fight cuz he never gets annoyed back at me but it still bothers me. i dont want to be so easily irritable and hurt his feelings by losing my temper at dumb things. im also arfraid that at some point, i will have tried his patience and he'll start yelling back at me which will destroy our relationship.
i otherwise have a very bright and sunny disposition. i know my husband loves me for my cheerful, open and kind personality. i dont want to turn into a nagging, wailing wife. can you please tell why i act so short-tempered at times and how i can avoid it turing into a habbit?
thankyou.

Could it be that your life is too boring and that you need studies or work to be more satisfied with your life. If you get a work, you are able to afford a cleaner, as you are not used to and may be not interested in household work.