Hair loss

I m 27 now but facing constant hair loss from last 5 years.
It started with the usage of a revlon product. I tried a number
Of homeopathic medicine but nothing is working. Even now
I am facing dandruff problem and major pain in the roots of my
Hair with a swelling in the scalp, it feels like sumthing is inside it
I mean liquid sort of thing but in actual it is just a swelling.
If I touch it and try to press it, it really hurts.
Worried about it and don't know what to do. The roots of the hair
Is very weak and the density is becoming lower and lower everyday
Plz help me to come out of this problem

[Caryopteris]

Please get tested for Celiac disease.  I have that, and your symptoms sound like a match for mine.  Celiac disease is a problem in your intestines that keeps you from absorbing nutrients, and some of the most common symptoms are skin problems.  Here is what I'd recommend:

1)   Get tested for Celiac disease.  If positive, find out about gluten and how to avoid it.  For a while you may also react to milk, nuts, even soy, so you may find you have to avoid those for six months or more also.  The safest diet is like the paleo/caveman diet, eating meat/fish/poultry, any fruits and vegetables, but avoiding dairy and really any grains.  There are gluten-free grains you may do fine with, but some people do best to avoid grains altogether. Having yeast out of control means you need to avoid sugar because sugar feeds yeast.  If you go off gluten and/or sugar, you will feel sluggish for a while as your body adjusts, but once you are "clean," your energy will be back much higher than before.  
2)  Get Wella Regulate shampoo, which you would have to order online.  It's not cheap, but you use a tiny amount.  It is very easy on hair and scalp and gets oil regulated.  Hair is soft and fluffy.  
3)  Try OTC Nizoral shampoo.  The oily scalp can cause yeast to grow too much, and it causes pain, itching, flaking, and hair loss.  
4)  Avoid products with wheat protein since you reacted to a particular brand of hair product.  You might even be sensitive to topical wheat gluten.  I guess I need to check Wella, but all I know is it was great for me.  Anyway, Dove products and Neutrogena products are wheat-free when I last checked.