It sounds frustrating to deal with severe dandruff and hair fall despite using many shampoos. Since typical shampoos haven't helped, a stronger treatment like a medicated ointment containing both a steroid and keratolytic agent might be effective.

One option is a topical ointment that combines clobetasol (a potent steroid to reduce inflammation and itching) with salicylic acid (which helps remove dead skin and scales). This combination can help control scalp conditions like severe dandruff, eczema, or psoriasis that might be causing your symptoms. However, such ointments should be used only under a dermatologist’s guidance because of potential side effects like skin thinning or irritation.

I recommend consulting a dermatologist who can examine your scalp, confirm the diagnosis, and prescribe the appropriate treatment including such ointments if suitable. They can also advise on safe usage and monitor your progress. If you want, I can explain how to use these treatments properly or suggest supportive hair care tips.To narrow down potential causes, we will need some more information.I understand you're dealing with severe dandruff and hair fall even after using medicated shampoos. To suggest the best solution, could you please tell me your age and gender?