Hi doctor, i am 48 yrs old..My menstration is come...

?How to treat heavy menstraution 
It's really important to treat heavy periods as fast as possible because it may lead to anemia as in you case , so the treatment should be under observation by doctor , he may starts the treatment by NSAID drugs such as ibuprofen or Tranexamic acid may be used and it's effective if used at time of bleeding , Oral contraceptive are also highly recommended espcially in case of thick endometrium , if there was an underlying cause , such as  hyperthyroidism , must be treated by  Carbmazol drug , some times surgical intervetion must be done to remove fibroids if present 

What tests should be done :
some tests can be done after clinical evaluation to determine the cause such as ultrasound for the uterus to measure the thickness of endometrium , and TSH T4 tests to detect if there is hyperthyroidism , ultrasound will show fibroids if present 
What are the causes of heavy periods ?
Obesity 
Fibroids 
Hyperthyroidism 
Thick endometrium
Advice :
your condition must be treated soon by gyncologist after doing the previously mentioned tests