Stay calm...that's first. You're right to be concerned, because his behaviour indicates that he really is fighting off something, not just 'teething' as the story can go.
The book I've used tons for my kids is called 'How to Raise a Healthy Child in Spite of Your Doctor". It says that a fever in children 9 - 24 months is very common, because their bodies are usually still getting some help fighting off disease from mom's milk. The fever should be left un-treated until 102.5 - 103. At that temp (or maybe a bit before or after, depending on your babe) children generally show signs of discomfort, such as flushed cheeks and lack of energy. Use cold towels (put them into a clean garbage bag and pop them into the freezer) and exchange them often. Lukewarm baths, as mentioned pp. As a last resort, homeopathic or otc fever meds can help reduce the fever. HOWEVER - the fever is DOING something useful, and reducing it isn't helping kill off the infection (usually viral, docs can't really help, but once it's in their hands, you have to TELL them if you only want help if they can identify it as a bacterial or fungal infection). So use the drugs sparingly.
Clingy behaviour is ok and normal for a sick child, especially one who hasn't experienced illness within their own memory. Nurse a lot or push fluids if you're not nursing. Cuddle and snoozle and get them to sleep as much as possible. Save the meds for nighttime, if you're going to give them, when it's hardest to sleep. They do get miserable when the fever is high, but as long as they don't get too zoned out, it's really ok to let them fight off the illness. Stay close, read books, listen to music, watch a vid. Illness, according to Rahima Baldwin (you are your child's first teacher author) is a time of exceptional learning and growth, partly because you DO spend so much time together.
Just for comfort, I had my daughter at about 16 months with a fever that ranged from 101 to 105 for 5 days before going to the doctor. I wanted to rule out some serious illnesses, but otherwise we were fine. It takes a lot of love, time, and attention to avoid intervention. That's why everyone ELSE goes there so quickly!
Hang in there mama! Sounds like he's going to be A-OK. Healthy Vibes... andy
Mama to B and O , wife to J and me to me! :