Welcome To Healthcaremagic forum,
Direct sunlight does not cause hair loss ,but it can cause dryness of hair and make it more lusterless .It can take away the shine from your hair.
In abroad you get lotions and conditioner which have additional sunscreen effect also.So if you can get one , it would be great(esp if you have more of out door activity).
As you said you ave hair loss along with a history of acne
& facial hair.I would suggest that you get a hormonal
profile done (blood investigation) to find out if you have nay hormonal disturbance or not.In such cases along with above problems some patients also complain of weight gain and irregular periods
I would advice you to consult a dermatologist
as they are equally competent enough for any hair problem as for skin and can check your hormone profile too.
Probably you might require a endocrinologist
consultation too if needed.