My toliets are on septic and will not flush after heavy rains or long showers. It gurgles and bloops when taking a shower. I had the septic drained about a month ago when I noticed some seepage in the yard. There is a strong odor coming out when it gurgles. It slowly drains after about a half an hour and flush after a few days of no rain.

All toilets are on the same level and across the house form each other.

The gurgle and bloops could be a vent problem but from the sound of your post I think your septic needs some major attention. Call for some local help. YOu should be able to find someone to give you a free estimate or at least only charge a trip fee that is refundable if you accept their proposal.