Respiratory rate monitor
You should not apply power rails to op-amps like you have done: -

Each op-amp power pin needs a voltage relative to ground or 0 volts. So you apply a positive voltage to one power pin relative to 0 volts and a negative voltage on the other power pin relative to 0 volts. Like this: -


Also make sure that your op-amp model can work with voltages as low as those you are indicating.
Also make sure that your op-amp's input common mode range is sufficient for the power rail voltages you are using
Also ensure that the op-amp's output voltage range is adequate for the power rails you are using.