If you have a multi meter and some skills working around high voltage electricity I can coach you on some trouble shooting.
Lacking that you can try what we call a 'soft reset' by turning the thermostat off for 10 minutes, then turning it back on again, If it has been exceptionally hot today the unit might have gone off on its high pressure safety cut out.... if that is the case look at the video below, and buy 3 cans of the spray foam condenser coil cleaner, turn off the power to the outside unit, then clean the condenser.
Let me know how that goes tomorrow after you get that job done.
Next I need the brand and model number of the unit that sits outside, and photo's of the wiring diagrams glued inside the electrical service panel on the outside unit and the blower service door on the furnace or air handler on the unit inside the house.
The photo's need to be well focused, taken from straight on, up close and well lit...I can use those to coach you on trouble shooting.
If none of this is in your skill set range, tell me which direction you are from the center of the nearest city and I will locate a short list of well rated service companies in your area.
We can go from there without a time limit.... I am off to bed shortly, if I miss you tonight I will pick up your response in early next morning.