As explained above, Raja Matangi forms an integral part of SriVidya sadhana. The primary deities of this tradition are Maha ganapati, Syama, varahi, Lalita, Bala and Para.
Worship of Shyama is to be undertaken only after the practices prescribed for Maha Ganapati. All of the Sri Vidya mantras require proper initiation for your sadhana to take effect. Shyama is worshipped in the anahata chakra where the sun is located. It follows that Her worship will have a positive effect on the afflictions related to the planet Sun.
If your primary interest is in overcoming certain problems, there are other ways to address that. Initiation and practice of the Sri Vidya mantras is a serious lifelong study.