Firstly, go to your doctor and check for these two things:
- iron levels
- thyroid function
Most times hair loss in women is caused by one or both of these (about 70%) of the times. other lesser causes include stress, medication and diet.
For something to stop the hair loss and help it thicken you can try a hair growth oil or serum. A good and effective one I have used is called 'Divine Herbal Hair Oil', it's a UK product, not available in SG yet :/ but they ship worldwide thankfully.
Also Minoxidil works well. I used some years ago but had to stop as it gave me side effects like burning scalp and headaches :/
Good luck and hope you manage to sort the problem