Hi, one opinion:
"Health issues"--you know, "we" don't.
You say clearly that your period of "health issues" marks a considerable change from your prior, life-long "really caring" (and presumably therefore "really working") for your grades, to someone who self-describes as "neutral" (at best).
That's a humongous change, and clearly likely ties in with your "health issues" period.
Three guesses: mental/emotional problems with "laziness" carryover; physical problems with "laziness" carryover; and "maturity development" related to your health issues (or a combination of two or three of the above) with "laziness" carryover.
You write you are now "seeing yourself differently." It is fair to ask, is this because you overworked yourself into a physical/mental/emotional sickness?
So, your change of health may have been a result of your general lifestyle, overworking. Did you take regular nature walks in a safe area, have a Sabbath, pray regularly, meditate, take care of a plant or (if permitted) a garden or an animal, help a child learn to read, etc.? If so, those relaxing and recreational activities may not have been enough to balance your incredible schedule of hard work.
Personally, would suggest talking to the licensed counselors 24/7 at 1-800-525-LOVE, general website http://www.klove.com
What is good about them is that they are good, intelligent listeners and conversationalists. If you feel like being mostly quiet, just explain that to them.
"Emotions: Transforming Anger, Fear and Pain," Marilyn Barrick,
"The Overachievers," Alexandra Robbins,
"When Invisible Children Sing," Chi Cheng Huang,
"The Great Divorce," C. S. Lewis,
"For Women Only," Shaunti Feldhahn,
"Expecting Adam," Martha Beck,
"Man's Search for Meaning," Viktor Frankl, and
"Man, Master of His Destiny," Omraam Aivanhov,
are likely worthwhile. Reviews at http://www.amazon.comhttp://www.freemeditations.com
is helpful re meditation.
It might be an adventure, perhaps not all good, but when you complete your junior year, you might have asked your counselor/a counselor as to the feasibility of a year or semester working for some science or other project/workstudy program. This would possibly help in several ways: encouraging you to realize that your standard of living does in part relate to your supplying to others what is considered of worth.
Whether it would be a semester working in a local nursing home, with some academic credit for e.g. writing a paper(s) on e.g. medical care conditions, or a semester workstudy program your college sponsors, or a summer or semester program such as
you have some leverage indicating that your semester of health issues has alerted you to the value of a second semester where you combine your academic interest(s) with some kind of work.
Be sure to talk (TALK out loud :) with your mother and other significant older adults about each of your issues: neutrality or lack of interest in being at the top of all of your classes, possible desire to work-study a semester, end of junior year or so, and what and where your science major is taking you. Be sure to look ahead re what e.g. a bio science B.S. leads to: Master's, or Ph.D., or technical training, and in what fields. You do sound intelligent, sensitive, and caring, as well as mature and socially intelligent (perceptive), so would also suggest that a major portion or aspect of your "future happiness in life" may be related to location. In other words, would suggest a more rural, natural, and pollution-free job focus, e.g. in the Pacific Northwest, the upper Montana-Minnesota (cold, I know), and in the Vermont area, hopefully close to your family (maybe they could move to a more pleasant, rural area near you?).
One other source of perhaps some value: business hours, M-F, 1-800-AFAMILY, ask for Counseling Dept., describe your current situation; they'll arrange with you to call you back at a time convenient for you, with resource recommendations. Their general website: http://www.focusonthefamily.com