What mleich says is good advice. I’d add:
-If you’re losing coolant, it could just be a leak, not necessarily a head gasket. On certain engines, it could also be an intake manifold gasket that’s causing problems. Get this checked out asap, for if coolant is leaking into the oil, it will quickly destroy your engine.
-Try a different brand of oil to reduce oil consumption. Eg. if you’re using Pennzoil, try a different brand, like Valvoline. You might also try a full-synthetic oil. My old 94 used to use at least a quart between oil changes before I switched to synthetic. Currently it uses maybe 1/2 quart with over 260K on the odometer.
Synthetic oil costs a little more, but if you’re dumping oil in the engine, you will quickly erase any savings you gained by using cheaper oil. Plus, if the car is using oil, it’s probably leaving deposits behind in the engine. Your engine should stay cleaner with synthetic.