I teach statistics in a psychology department. You would not be the first student to mindlessly make it through stats without really understanding it and you will not be the last. I have graduate students that cannot remember a single thing they learned from stats.
Will you have trouble in later classes? Maybe. It would be common for a research methods class to have you conduct a small experiment and analyze the results. You may have other advanced classes that also have you collect and analyze data (though usually nothing overly advanced). You will also be given original readings from journal articles that will have results sections full of stats that you will need to have at least a basic understanding of interpreting hypothesis testing.
I think you have demonstrated that it is difficult for you to take more than about 12 hours of coursework. You need to respect this limit. See if your math center has tutorial services for statistics and utilize them during your research methods class when you get to parts talking about data analysis.
You can also do some self learning over the winter break. Check out Khan Academy:
Here is a class on Coursera:
(Probably only need the 3rd and 4th topics, and if I understand it correctly, it is free if you don't want their certificate, which is not really worth anything.)
You should be able to find more. Anything aimed at psychology, social science, education, or business should cover similar material you covered in your class. Anything aimed toward advanced math or computer science will likely cover different topics. Working on it now while it is still fresh in your mind would be best instead of waiting until summer or next fall to refresh yourself.