Why don't doctors give prescription for worms when obvious, or even just to eliminate that posibility.???

Conversation with MD. It sounds like you need to have a proper discussion with your doctor - because you are not happy with the treatment plan. Doctors should always weigh benefit of treatment vs. risk - and so every drug/vaccine/intervention needs to be considered that way. Not sure 'why' your doc didn't come up with a plan that was acceptable to you - try a second opinion if you can't work it out with that first MD.