Can a Doctor NOT tell me the treatment after blood/urine test?

The fact that you didn't get a receipt doesn't matter. By law the Dr is required to keep medical records and must release them to you if you request them. It is illegal for him to deny you your records. He can be sanctioned by the medical board and have his licensed suspended or revoked. I would call the office one more time and request medical records and let them know that you will be filing a complaint with the state medical board if their office does not comply. I would also demand a treatment plan as well. You already paid the man for a diagnosis which should include a prescription. I would follow through with this threat and make a complaint either way because I'm sure he will continue his bad medical practices until he is sanctioned. You can easily look up the number to your states medical board online and file a complaint.