I was visiting my dad and saw how non-existent his short term memory is. Should I get him to a doc to see how bad this is and see if they would suggest guardianship?

Told him to remember 3words and he could not and he prescribed meds. He has He repeats the same stories over and over and most are not true. Never remember that he just told you 2 minutes ago. He gets lost and drives alone to florida from Chicago by himself just to return the next day. God know how if found his way. He drinks and takes sleeping meds. He has wrecked several cars and has had a DUI. I have him visiting me now in Texas and he wants to drive home alone tomorrow. He just got here. I drove him here He wants his bars and restraurants and friends. He spends up to 1k a day gambling. He thinks he is fine, perfect. I have not told him the truth about why he is here, if I had he wouldn't be here. Now that he here, I was going to start by meeting with a couple of visiting angles to baby sit him for a day until I can make some plans. Should I get him to a doc to see how bad this is and see if they would suggest guardianship.? he is not paying bills, but his home is Indiana not Texas and we do know have 10 bars in driving distance, if he drives home along he will get lost and confused.
Probably mugged to as he carries a ton of cash. God I did not plan well what was I thinking.