I have a 12 year old Shih Tzu and I was just wondering if I should give him worm medicine for parasites?

for no specific reason my yorkie will start to drool, shake, pant while he is wide awake. If he trys to stand up his legs give way. What do you think this is ?my vet said poss epilepsy, however as he is 2 years old and that these “episodes” happen few and far between she does not want him to be on meds. He has had these while relaxing at home, out playing in the garden etc and he has had around maybe 5 all together and they are months apart. He is up to date on vaccinations/frontline/worming. What can you suggest i do while he is having them as i can not leave him as he wants to follow me and he cant follow me as his legs give way. Has any one eles had these symptoms in a dog ? what do you do ? All suggestions are greatly appreciated thank you

Its only 4 weeks old and i some symptoms that he has is a bloated belly and he eats a lot and even when I try to help him poop he wont hes only pooped twice in 2 days, i heard these are some of the symptoms to round worms so i was wondering if i could give him the medicine because of his age?