Hello. Since you are exclusively breastfeeding a 1-month-old baby, I would not recommend restarting Acidum Nitricum 30C on your own simply because you have taken it previously.
Your long-standing piles and fissure also deserve proper assessment, particularly because they have been recurring for many years. During breastfeeding, treatment can be selected safely according to the exact condition and severity. Several conventional topical treatments for anal fissure and haemorrhoids are considered compatible with breastfeeding when appropriately used.
For now, focus on keeping the stools soft, drinking adequate fluids, eating sufficient fibre and avoiding straining during bowel movements.
Next Steps
If you tell me whether your current problem is mainly pain, bleeding, burning, itching, a fissure, or a lump, and whether you are constipated, I can guide you regarding the appropriate next step.