Have I got the pillow face due to an overfilled mid face? Can you advise how to balance out my face? (Photos)

you really need an unperson consult. fillers can be reversed and long term it maybe best for you to do sculptra, threads and morpheus for tightening and lifting rather than just "filling" with fillers.For facial rejuvenation,  I would suggest a combination approach of 
1) skin care with products and PRP/microneedling
2) PDT light therapy few times a month with growth factors
3) laser treatments like clear and brilliant regularly and a few times a year Fraxel/halo Viva, Co2/Erbium
4) Sculptra injections a few times a year for collagen production with fillers like juvederm/restylane/belotero/radiesse/bellafill
5) thermage/ultherapy for yearly skin tightening with or without PDO or cone based instalift threads for lifting
6) botox every 2-3 months to stop movement lines and prevent lines at rest
7) deep microneedling RF like Fractora/morpheus8 for tightening of the skin
8) Vascular laser like vbeam/excel V or BBL forever young treatment every quarter (3-4 months)
Best, Dr. Emer.

It is difficult to tell what is going on as your photos are limited.  It would be best for you to schedule an appointment with an experienced provider who can assess you and develop a long term plan.

The photographs you submitted are rather limited and the proportions of your face cannot be evaluated. The best bet would be to be seen in person by a plastic surgeon who can make recommendations and appropriate treatment. I hope the self sync good luck from New York City plastic surgery