Please help me ease my mind

Ні,
I hope you're well. I've seen that you help people by answering their questions, and as a nephrologist, I hope you can help me ease my mind. I'm really afraid and have an appointment with my nephrologist in a month.
I had three phosphatic kidney stones (two in the left, one in the right). I passed two but still have one in my right kidney. I also have constant foamy urine and intermittent leg edema, which usually resolves by morning.
Six months ago, my 24-hour proteinuria analysis showed 230 mg/day and then 116 mg/day. While within the normal range, it's still high normal. I'm worried this might be linked to multiple myeloma.

Here are my recent lab results from two weeks ago:

Hematology Results
• Hemoglobin: 15.8 g/dL (Normal range: 13.0-17.0)
• Leukocytes: 9,700 /mm (Normal range: 4,000-11,000)
• Platelets: 369 x 10¾uL (Normal range: 150-450)

lonogram
• Sodium: 141 mmol/L (Normal range: 135-145)
• Potassium: 4.5 mmol/L (Normal range: 3.5-5.1)
• Chloride: 102 mmol/L (Normal range: 98-107)
• Bicarbonate (Alkaline Reserve): 25.8 mmol/L (Normal range: 22.0-30.0)
• Phosphorus: 27 mg/L (Normal range: 25-45)

-Uric Acid: 51 mg/L (Normal range: 34-70)
-Urea: 0.22 g/L (Normal range: 0,18-0,45)
-Creatinine: 10,2 mg/L (six months before was 11,4)
-eGFR: 90 (six month before was 79)

-Total serum Proteins: 76 g/L (Normal range: 60-80)
-25-(OH) -vitamin D (D2+D3): 14,6 ng/mL (Normal range:
>30)
-PTH (parathormone): 44,1 pg/mL (Normal range:
9,2-44,6)
-Serum Calcium: 99 mg/L (Normal range: 86-103)

Urine Analysis
Protein to Creatinine PCR (Spot Sample)
• Proteinuria: 118.8 mg/L (Normal range: <140.0)
• Urinary Creatinine: 2,040 mg/L (Normal range:
220-920)
• Protein/Creatinine Ratio: 0.06 g/g (Normal range: <0.30)

Spot Crystalluria: NEGATIVE

Cytobacteriological Examination of Urine
• Appearance: Clear
• Color: Yellow
• pH: 7.0 (Normal range: 5.0-7.0)
• Glucose: Negative
• Proteins: Negative
• Blood: Negative
• Leukocytes: Negative
• Nitrites: Negative
Microscopic Examination
• Red Blood Cells: 0 /ML (Normal range: <5)
• Leukocytes: 2/ML (Normal range: <10)
• Casts: Absent
• Crystals: Absent
• Epithelial Cells: Absent
• Yeasts: Absent
Bacteriological Examination
• Culture: No bacterial growth detected