My 1 eye keeps feeling as tho its going crosseyed, had eye test and they found nothing wrong. Just keep seeing double now and then its horrible?

Get second opinion. If you have an eye misalignment that is causing double vision, you need a medical evaluation. If you had one and they found "nothing wrong", seek another opinion.
Eye coordination. You probably had some degree of mis coordination of your eyes in childhood which you adapted to. This has broken down and this causes doubling of the vision. Your best bet is to seek out an expert in strabismus or neuro-ophthalmology who can evaluate this and recommend treatment.