. From what you describe, it you may have a timing belt problem. They can slip and mess up the engine timing. The cost is within believable.
. According to the information I have you have an interference engine. That means if it breaks, it can do a large amount of expensive damage to the inside of your engine. Generally the owner’s manual list a replacement schedule for that belt. You have not told us if you have ever replaced the belt. If you don’t know I would avoid driving it until the belt is replaced. If a belt slips, it usually means it is about to go and BANG with no more warning than you already have.
. So unless you know the belt as been recently replaced, I would not be driving it to the grocery until it is replaced. Along with the belt, on most cars it is a good idea to replace the water pump and tensioner at the same time. It will save you money in the long run.
Keep us informed and good luck