First things first, drain your ATF, all of it.
Take the filter out, buy a new filter (if you can't find a new one, clean the old thoroughly using petrol and loads of petrol and then use compressed air for some finish, run some water through it, dry it out with compressed air and have a final look at it)
Get a new ATF, a cheap one at that, for example the normal STP/warco fluid, fit all things back together, fill in the ATF, try your car! if it works, you're good, drive it on cheap fluid and if it is running fine, after for about 500 kilometers change to Caltex Texamatic T888 ATF.
If not, then we'll go further.
Good luck.