The problems associated with insulating brick, block, or concrete walls vary depending upon environment, construction, and even sunlight. It is critical to get a proper assessment of the overall situation. This is an instance where money spent on a documented professional consultant is money well spent.
I have come behind DIY folks many times. Some of them did well but most threw dollars away, or worse, created far worse problems. When the Feds pushed for greater sealing of walls, it was soon discovered that the lack of adequate ventilation resulted in exterior paint bubbling, a reaction to vapor forming inside the walls, often rotting sheathing and studs. Mandatory additional room venting was required.
Cooking, showering, and just living creates enormous amounts of moisture that has to go somewhere. I have had success with batting interior masonry walls, leaving an air gap. In subterranean situations I have used brush on sealers. On both interior and exterior, even floors, to stop moisture intrusion in combination with employing venting methods. Often the introduction of a dehumidifier of a simple small fan will halt mold in corners. Remember to use vapor barrier paint under your finish coat. Great stuff.
There is more that almost 50 years of this work and a willingness to research has taught me. I can't emphasize enough the value of an expert for you.