It's very unfortunate that you are facing this problem and we are sorry as we can't prescribe anything online...it can be androgenic alopecia which is due to excess of male hormones...or telogen effluem...try to have healthy diet at regular intervals,drink more water,manage stressful situations smoothly if possible avoid them,biotin supplements helps you...you will require topical agents like minoxidil which will maintain hair density and also helps in new hair growth...consult dermatologist they will do the needful
No hair oil cosmetic products are known to have desired results.
You need to consider medical options and homeopathy has many safer and long lasting results without affecting your hormones if its male pattern baldness .
All medications worldwide are known to slow down and control the hairloss but regrowth fully and reversing of density not possible medically.
Meanwhile few things people who loose hair should be avoiding are=====
Smoking,excess of alcohol,excess red meat,avoid too much oiling or gel usage on hair,avoid any straightening or color.
Eat lot of iron rich and protein rich diet balanced.