Left solstice in garage 6 months when i whent to open door battery was flat had to open door with key manualy alarm whent off since then car does not drive well any sugestions

Many cars with remote entry will not work properly with a low battery. Have your battery tested and recharged or replaced if needed and see if that fixes the problem. I experienced this just this weekend when I tried to unlock my 2008 Nissan that has been parked in my garage now about three months and not driven. Re charged the battery with a battery charger for about 12 hours and all is fine again.

PS: Most major auto parts stores with test your battery and alternator for free while still on your car. Only takes a few minutes.

Lock ALL DOORS, Disconnect the Battery... Wait 2-3 minutes and connect the battery and it should reset itself. Make sure all doors are LOCKED...

AND that you have a KEY to open the door in case it does not work.

engine management should read the transponder chip in your key and deactivate the alarm the battery in the key is charged while key is in ignition if the key hasn't been used for a while maybe its flat

Have you tried a new battery in the remote, or do you have a second remote you can test. Either your remote is worn out or the battery is dead.
Once you lock the car with your remote it will active the alarm and if you use your key it won't deactive the alarm only your remote will, on some cars putting the key in the ignition will deactive it.
If you can deactive your alarm with your remote and can just manualy lock and unlock your doors and that should prevent your alarm from going off until you get a new remote or battery.

If the trunk works try it. If not any place that sales auto alarms can fix it. An a tow guy should have a slim jim

If your key will not manualy open door
Try it in boot lock,it might activate central locking

You must LOCK Doors Manualy,then UNLOCK DRIVER DOOR WITH KEY this should Correct the Problem.

UNPLUG EVERYTHING NEAR THE GARAGE EXCEPT THE OPENER IF THAT HELPS PLUG THEM IN ONE AT A TIME UNTIL YOU FIND THE PROBLEM.
PROBABLY RF COMING FROM SOMETHING IN THE GARAGE, FREEZER, BATTERY CHARGER (IN AN RV OR MOTORCYCLE)
OR A LIGHT TRANSFORMER - EVEN ANOTHER DOOR OPENER CAN CAUSE PROBLEMS - YOU DIDN'T LIST THE BRAND OF OPENER, GENIE HAS REPLACEMENT RECIEVERS IF YOU HAVE MORE THAN ONE UNIT IN A GARAGE.
HOPE THIS HELPS

try opening the doors manualy WITH THE KEY. 2x's Driver side
These cars have sensors that read the key chip and once it recognises the key it will start working again