Pediatrician says my 18mo needs tubes. This scares me. Are there any other options? Anything holistic or homeopathic profilactic?

Nope. Although tubes are not the perfect preventative tool and one option is to continue to treat each infection seperately, there are no holistic or homepathic remedies that even remotely help prevent ear infections, despite contrary claims.
See an ENT. Myringotomy tubes are placed to allow any fluid or pus from the middle ear to drain out the tube and out the ear canal. They are done to allow your child to be able to hear properly. If your child cannot hear properly, they cannot talk properly, and that is why your pediatrician is recommending it. See an ENT and they can discuss options.