Pigmentation On Face, Skin Keeps Deteriorating. Tried Many Medication And Pixel Laser. What To Do Now?

Question: Hello Doc, I have been fighting pigmentation on my face for more than 3 years. Initially, I consulted a skin doc in 2009, he suggested me to apply depiwhite every night and used sunscreen (15+spf). I used it for almost a year, but I didn't see any changes. Later, I met a dermatologist from fortis hospital. He advised to to use kojivit gel every night, cap Antoxid every alternate day and suncrose, a sunscreen lotion whenever i go out, atleast before 15 mins. I continued for about a month, it lightens a bit but not to the extent that i was looking for; then he started glycolic peel every 15 days. I did 5 sessions, but still it didn't work; then later we went for TCA peels - 4 sessions every month. Last TCA peel was on 20th Oct 2011. Well after TCA peel it gets worsen, I got post hyperpigmentation scars. It was very visible now as If I met with any accident.Later doctor gave me to try Tretin Cream 4 times per week at night and as usual continuing Sunscreen thrice a day.
Then on 20/11/2011.. I had gone pixel laser, Feudin H (5 times), Neutrogena SPF 50 thrice a day, adv to wash face with Cetaphil cleanser twice a day.
It lasted for couple of months and my skin kept deteriorating. This year, doc advised to apply melacare forte every night and sebamed sunscreen (50), derantox antioxidant every month which I'm still taking. To my surprise, after a month, I can see the dark pigment faded away and I can see some kind of pinkish color on my face which was very good, but it didn't last long. The dark melasma came back again. Then doc feels that I got allergy to hydroguinone based cream. Then he gave me depiklen to apply every day twice a day. Plus mesoglow - some kind of injection of highly concentrated antioxidant and other lightning natural ingredients to my skin. But I didn't see any result. Then later a skinlite cream 0.2% hudroquinone based cream was advised to apply every night..it worked for some days but again it came back. Now, he has given me melaglow to apply every night, eat derantox every day, sebamed 3 times a day. I'm using meladerm twice a day for a month now, but still the hyperpigmenatation is very visible. Is there a way out where I can get my natural skin. I felt that I shouldn't have met the doctors at all, I felt I have exploited my skin and left with no choice; I hardly go out to sun. Please help me.

Where can i get this modified kliggmans formula skin lightening agent & Triglow cream?