Can be used in this lactation period. Usually it's no big deal, and it won't affect breastfeeding. In this lactation period, it is best to pay attention to diet to increase nutrition and eat more foods with high calcium content.
Moxibustion has the function of warming meridians and dredging collaterals. According to the situation you described, moxibustion can be performed. You can also go to the Chinese medicine department of the hospital for acupuncture and physiotherapy massage to relieve discomfort. I suggest you have more rest, don't be tired, live a regular life, ensure adequate sleep, keep a good mood, avoid nervousness, strengthen nutrition, diversify your diet, and have a regular check-up 42 days after delivery.