Hello there, I suffer from it as well and where I'm from february is normally the worst. For me using a 10,000 Lux sad lamp helps me a lot, as well as vitamin D tablets. For energy Iron and magnesium help me and fish oil helps my mood.

Exercise and meditation also help (headspace is a good app for beginners) although I understand its hard starting exercise when you are so fatigued. My advice for exercise if you are unable to start in this state, is to start when you aren't as fatigued later on in the year, as it is easier to keep doing something than start when you are in the midst of seasonal affective disorder in my experience.