I am a Kagyu practitioner (Karma and Shangpa). My teacher told me not to rush back to practicing, but the longer I am away from it, the more I feel reluctance to begin again, even though there is suffering. I am hoping my reading will help spur me on, but I feel the need for more motivation. Thank you for the suggestions so far.
Having problems sitting/needing to take a break is perfectly ok. When it happens for me, I take post-meditation as my primary practice--seeing perception and thoughts as empty. I also spend more time reading/studying. Have you by any chance read the wonderful book by Gendun Rinpoche, Heart Advice from a Mahamudra Master? It gives excellent advice on approaching all aspects of practice and assessing our meditation.
It might be worth spending some time assessing whether there is any subtle tension/grasping/forcing in how you practice or want to practice (not saying there is). If there is, it's guaranteed the mind will rebel in equally subtle and not so subtle ways. Also, with the right approach, that feeling of reluctance itself can be used as the path, since it arises in the mind and is therefore empty.
I'm not sure how long your meditations were, but rather than doing longer ones--even as long as 30 minutes, you might want to try short meditations in the area of 5-15 minutes, but perhaps done more often during the day (if possible). I've found that to be effective. It provides a sense of freshness and breaks up a lifeless routine. The main thing is don't cling to how your meditations used to be. Let the staleness of the old go, and relax. Find your own way to bring a new freshness and living joy into your practice--as if you were taking a deep breath of invigorating fresh mountain air.
Hope these were of some value. Best wishes!