well in my opinion this is the worst time to be learning Spanish for you. if you only stared learning Spanish a year ago or less and then started into french and continued them simultaneously, you’d have it made. if you were already fully fluent in french and then started Spanish, again you’d really be making a go of it. but being nearly fluent in french, and then starting Spanish at this time is really the worst.

i tell you this from experience. i was “nearly fluent”in french when i started italian and the confusoin was terrible. i actually stopped taking italian due to it. now i’m doing german which i’m also confusing with french. what’s the problem here? it’s that i never finished getting fluent in french! that’s the rub!

edit: if you’ve been speaking since you were a child, how come you consider yourself nearly fluent? impossible, you are fluent then. in that case, the confusion should soon pass

My mother-tongue is French and I started Spanish at the age of 14. I had no difficulty with mixing them up. But I know what you mean because I wanted to learn Italian at the same time with Spanish and it did not work out. I went to Spain and learned the language thoroughly and then started with Italian that went well.
I don’t know if you have the chance to go and live for some time in a Spanish speaking country but if not find somebody who’s mother-tongue is Spanish and get together a few times a week only speaking Spanish of course it will help you very much.
I speak from personal experience.
Te deseo mucha suerte no te dejes vencer.

I was in a similar situation when I started learning Spanish and I found that the main thing that helped me was spending time in Spain. Even a holiday would help give you more of a feel for the Spanish language and the better your Spanish gets, the less you will mix them up.

don’t take take them at the same time.

loretta stones!