does the cold weather making everyone sick

or it's just me? last october i got pneumonia , valley fever, etc.. now i feel like im getting it again idk why!! it's freakin cold in california right now. like :/ and to top it off i work outside which i am trying to get another job because its making me sick i am a yard duty supervisor at a elementary .school lately i been feeling ill . i do have arthritis too but thank god it's not acting up because i am taking my meds for that but as far as the pneumonia i am so scared to death it will come back because i been coughing again and feeling the same symptoms in october 😭💔💔💔 why is it still lingering on. me ? and also why is the valley fever still lingering in my blood too since october ?