Well that was spontaneous question, you may skip it.

What sort of picture do you have in your camera?
Because if you want to use it as proof, it should be more than a picture...
And also about the people who are watching you? Do you know their names and other particulars? Why they are keeping a watch on you? What is their motive and what benefit they can get by hurting you?

The way you talk, you seem like a innocent person, who is caring and sensitive and would not harm any one, then why on earth someone would think to hurt such a person?

Regards
ZILCH HOUR