Hi Marion,
Just read your post and the last line struck me....life plan? Life tends to get in the way of plans! Things happen, good and bad. Sometimes when you have a plan you overlook or do not appreciate good opportunities, because you haven't planned for them. You get stressed trying to fulfil the plan.
Take a step back. Consider these questions. Are you enjoying the course? Would you enjoy it more if you were not concerned about any outcome eg job prospects? If you feel you would not enjoy it whatever, what's wrong with giving up? What are you doing outside of work? Have you time to look after you, time to follow or explore new interests, hobbies , voluntary work? Time to follow up the unexpected, unplanned for opportunities?
As to processing information, yes, learning can get harder as you get older, hormonal or not, but it's amazing how much easier it is when you are passionate about what you are learning. Then it is not so hard to do the extra work.