Should i be worried about one tonsil is bigger than the other and has been for a while now, no pain but tonsil stones caught in crater behind the tonsil? also flap of skin at the front of the tonsil is different to the other side?

It is not uncommon that people have tonsillar hypertrophy due to recurrent tonsillitis may be prominent unilaterally. Stones come out from the crater will be more from the bigger one. If one tonsil is bigger the anterior pillars (flaps of oral mucosa in front of the tonsils) are also different. You have nothing to worry if those findings have not changed for quite some time.