Thermostat

My w has stopped working out of nowhere after an internet connection outage.  I can’t afford to buy a new one right now, please tell me that this can be fixed? I have a child who suffers from chronic: 

• Anhidrosis/hypohidrosis — the body cannot sweat normally, so it cannot cool itself.
• Dysautonomia or POTS — heat can cause a rapid heartbeat, dizziness, fainting, and dangerous blood-pressure changes.
• Multiple sclerosis — heat may sharply worsen neurological symptoms, known as Uhthoff’s phenomenon.
  
  

so I really need this fixed as soon as possible for my child’s health!!!