My dog is my best friend. Today is his second birthday!

Anyway, the trouble all started with my cat. She loves sleeping outside. My dog of 10 years passed away and we missed hearing the clicking of doggy feet on the floors so we got a new puppy. He started scratchings within days of getting him.
theyre on and off, we went ~8 months from fall of 2009 until maybe mid june of this year, 2010, and then they came back and they came back full throttle, to say the least.
Theres no life cycle with this batch of fleas. There used to be a point where the adults would lay eggs, then die, and then before they hatched we would bathe the cat with an effective flea medication and then thats how we went almost a year flea free. But now there are adults and babies on my dog. He scratches himself, bites constantly, and if he is left home alone and bites he will rip the hair out of his paws. I feel terrible for him and it breaks my heart and i feel like the worst pet owner ever. I want to get rid of them immediately so he can live freely and happily and be the healthiest he can be. Minus the fleas he's a very carefree dog.
The problem i'm having is finding something
safe for us to use on him. I used the hartz flea collars but they had a really bad effect on my old dog, their products gave him seizures and i never even clued in until he passed away how sick they made him.
With my current dog, i tried using the small spot applicator bottles from pet stores, and i did not like the side effects in any way. He was not himself; he would whine, yelp, try to hide, curl up under the table, and it was like he was being burned. He also had really watery discolored poop for a day after. I don't want to give my dog a product like this.
I looked into both frontline and k9 advantix and was not surprised to see it had very negative results on some dogs. It may have had positive results but i cant look past the deaths and illnesses and harm, so im not buying them
i guess what im asking for might be a miracle..im at my wits end. What can i give him that wont harm him, or my family members? I need these fleas gone, theyre emotionally draining me, im embarrassed to have people over in my house, for fear they see the fleas or bring them home to their own pets.
please help! anyone who has had them knows how hard fleas are to deal with.