pufflemum, it does sound like you need to up your fat intake for fuel. When you eat few carbs, you need to replace them with fat.
A few pointers for upping fat intake:
Try making your own mayonnaise with light tasting olive oil. There are plenty of guides online (just search for paleo mayonnaise) and you quickly learn. It's great with tinned tuna.
I make paleo pesto with basil, olive oil, pumpkin seeds (my dh is allergic to pine nuts and they are too expensive anyway) and lemon juice/peel. You can make with any fresh herb (I get them on offer or from the local Asian shop) and pesto is great as a salad dressing or with steak.
Coconut milk is a good source of fat. I sometimes make a green smoothie of spinach, coconut milk and an avocado (another great fat, avocado oil is delicious, but expensive). Coconut oil is an excellent fat but expensive.
Make sure your salad is drenched in olive oil and pour olive oil over cooked veggies as well.
Lard is another popular paleo fat. I can't stand the smell when frying but I don't mind the taste.
You can also use goose fat or duck fat and you can even use the fat from cooking bacon (get the rashers, they are fattier than back bacon) for cooking.
When you buy mince, try to get the fattier versions. And make sure you get chicken fillets with skin on.
Fish: Sardines, mackerel, tuna and herring are the fattier fish.
snoworneahva, I didn't know that was why ghee/clarified butter is better tolerated. I recently got some from my local Asian shop and it's great stuff for cooking.