Is this really worth it?

I am now in week 4 of my intensive German course. I had been saying for 12-14 years, "just let me retire and I will take German and learn it this time" [I have taken 3 entry level courses over the last 18 years!] My 2 teachers are really good in Level 3 where I ended up. I tried level 4 for the first week, and by Friday, my eyesballs were literally rolling in my head! so I asked to go down to level 3. Good Idea!!! This week we are studying articles and personal pronouns and their often incomprehensible cases: nominative, accusative and dative, when modifying a noun which also have the three cases!
Get the picture? Me neither.. but I WILL PERSERVERE.