HIV through sharp object

l used sharp object in 2007 and start developing some pimples on my legs and losing weight.l have tested for HIV twice this year and the result was negative. is there any disease that can cause me those problems. losing weight is now the big challenge but here and there 
 
Use of a sharp object _does not_ necessarily mean that you will contract HIV. HIV is transmitted through objects that contain HIV infected blood or body fluids on them. Objects in common use that can have HIV on them are razors or needles and syringes that have been earlier used by an HIV infected person. It may be that the object you used was not contaminated with HIV. Loss of weight can be due to many other causes which will need to be investigated thoroughly. You must consult your doctor for the same.