LIke i said befor, the symptoms you are experiencing can be due to - a thyroid disorder
, uterine fibroid
...all of the above cause heavy menses, and further cause anemia leading to weakness and so on. Please do the following tests- CBC, T3, T4, TSH
, Abdominal USG and visit a gynaecologist for an examination
Meanwhile take a balanced diet, rich in red-orange fruits, Figs (anjeer) & dates are good sources of iron , which you need right now and even later when you get pregnant.
For abdominal cramps you may use ice-packs. Drink plenty of fluids and keep your bladder & bowel clear.
Remember if there is any of the above condition present, you may not be able to conceive , also you are not fit enough to conceive at this moment.