Your 98 Toyota Camry hit speed bumps when going over them even at a very slow pace?

If you mean the car is bottoming out (car frame contacting the speed bump) the you need to replace the front or rear suspension. Either the struts are worn out, springs maybe broken or weak. Another thing I've run into is the weight the car is carrying. I had a guy who we replaced the suspension in his 78 2dr Honda civic and he still complained of it bottoming out as he exited his underground parking. Nothing was found to be wrong with the suspension but upon questioning the man I found out it only happened when his son was in the front seat and his wife & motherinlaw were in the back. Problem was, both ladies were larger plus size (no offence intended folks) and the car could not carry the weight all in the back seat. Most shops will give it a quick check for a nominal/free charge but you need to start with the height the vehicle is at and a bounce test. Push on the front or rear corner by corner and see how mushy it is.