Hello dear
*First of all I would recommend RT-PCR test done if you can as covid crisis is growing day by day and considering you are a breastfeeding mother, taking risk would not be a good option.
*Apply N-95 mask whenever in vicinity of someone (Specially during feeding your baby) till RT-PCR report comes.
Next Steps
For cold and running nose, antiallergic and nasal drops can be taken.
Health Tips
If you wish to consult me regarding this and get proper prescription you can contact me directly over Text/Audio/Video on Practo. Thanks and take care.