Help me

Archana.
Hey my periods are irregular so time 45days cycle some time more than that ..my last period was 19th may n till now I have not got periods I have checked my pergnancy test on 6th July n it was negative n from 2days I m not feeling well back pain felling dizzying n stomach pain sometimes..so should I take again test or what ? Can any one tell me what should I do?? Thanks in advance