Low in january

Hi, wondering how other people cope with a low mood in January. I suffer from this every year from about end of December through into February, when I pick up. It's not exactly depression, more a mindset of anxiety, restlessness, worry....I worry about getting ill, dying, not sleeping, relationships...I feel like leaving everyone this time of year and going off on my own and it intensifies every year. It's hard to focus on anything positive and I get angry, critical and irritable with people around me. I try to spend time outside, I meditate regularly, don't have a crazy diet, have loving friends and family but it's like none of that makes any difference. Then in middle of February, it all seems to change and I feel more positive. Am I alone in feeling like this?